Follow up to this project
I added lead tape to increase calculated swing Wts to C7- C9. ~ 4 g per head.
Feel is good now and not boardy at all anymore . I'm getting a nice penetrating trajectory which is fine and I'm low ball hitter . The feel is r flex + with their frequency at 273-275, not sr flex feel I expected. Better dispersion on good strikes even with more the demanding Mizuno MP 57 CB heads. I landed all my PW and 8 iron approach shots and all the parr 3s and even birdied 1st hole which was my first in LONG time.
Going to take a long time to get proficient with the Mizzys with more playability less forgiveness but I now like the feel and trajectories, Their classic look is great too. Old school is me with emphasis on Old.
Good shafts is my assessment. Guessing it doesn't matter with Matrix closing up. Find something you like , it disappears.